White Smoke And Misfire, Perkins Engine
The needle needs to be at 30 minutes (ie. half a degree) different to the seat angle, otherwise the injector spring cannot exert sufficient pressure on the point of sealing to create a sufficiently tight enough sealing pressure (as the spring... Low Compression Causing Unburnt Fuel It is possible that anything which causes low compression can cause incomplete burning of the fuel, as the diesel engine works by compression ignition. provided injectors and pump have been done, and depending on the job done on them, sometimes the leak back wont work on the injectors for a while. If the original head is serviceable then I would definately go for new guides and seats in your original head rather than the new £200 one. One common reason for this at low revs (but no white smoke at high revs) is dribbling injectors. So not only is there more spring pressure applied to this point, but also the circumfrance of the sealing surface is much smaller (at the cones point) and so less sealing area so leak. theres too much diesel being delivered to injectors but the leak back cant work so it gets forced into the cylinders. However, given the symptoms of white smoke only at low revs then VTE thinks that the injectors would be the first thing to look at. hi. seen prob similar before. The Cause Of The Smoke White smoke is usually unburnt fuel. We have even experienced this with new injcetors and have had to re-grind them on the Hartridge Injectomatic machine to re-finnish the angle at the bottom of the nozzle and the needle. The two front cylinders come out of the one front hole, but you can sometimes differentiate between the two front cylinders if you look carefully enough. The outer cone is the nozzle and the inner cone is the needle. If they are cut at exactly the same angle (or worn so they are now at the same angle) they will try to seal along the whole length of the cones. You should be able to see which cylinder is producing the white smoke (if it is one particular cylinder rather than all of them). what happens is the pump is working at peak efficiency, and the injectors are very tight. When hot and working hard the engine runs fine, seems to have sufficient power and burns clean with no white smoke. The Problem We recently had a message from Jock who has been getting white smoke and misfire when the engine is ticking over (Perkins 3A. 152).